[Bug] - Conversion of old boolean values to new ExporterEnabledState does not work when in quotes

[aaronweissler]

Describe the bug
When the boolean for the enabled property is written in quotes, it is treated as a String by Spring and therefore can not be converted using the BooleanToExporterEnabledStateConverter

To Reproduce
Steps to reproduce the behavior:

1. Set an enabled property to "false"
2. Start any core test that loads properties
3. See error in logs

Expected behavior
Convert the value to equivalent ExporterEnabledState

Additional information (screenshots, stack traces, etc.)
Caused by: org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [rocks.inspectit.ocelot.config.model.exporters.ExporterEnabledState] for value 'false'; nested exception is java.lang.IllegalArgumentException: No enum constant rocks.inspectit.ocelot.config.model.exporters.ExporterEnabledState.false